Allow nodejs >= 12, more unit tests (#28)

+ some dependency version bumps

Author: ASEIDEL77

.gitignore

@@ -1,2 +1,3 @@
 node_modules
-coverage
+coverage
+.vscode

__tests__/tokens.spec.js

@@ -11,6 +11,7 @@ const validToken = {
 }
 
 jest.mock('needle')
+
 test('should fetch token', () => {
   needle.mockResolvedValue(Promise.resolve(validToken))
   return tm.getToken().then(t => expect(t).toEqual(validToken.body.access_token))
@@ -36,13 +37,71 @@ test('should call requestToken() only once with many parallel getAuthHeader() ca
       spy2.mockRestore()
     })
 })
+
+test('should call requestToken() only once with many parallel getAuthHeader() calls', () => {
+  needle.mockResolvedValue(Promise.resolve(validToken))
+  const spy = jest.spyOn(tm, 'requestToken')
+  const spy2 = jest.spyOn(tm, 'getToken')
+
+  const proms = []
+  for (let i = 0; i < 10; i++) {
+    proms.push(tm.getAuthHeader().then(h => expect(h).toEqual(`Bearer ${validToken.body.access_token}`)))
+  }
+  return Promise.all(proms)
+    .then(() => {
+      expect(spy).toHaveBeenCalledTimes(1)
+      expect(spy2).toHaveBeenCalledTimes(10)
+      spy.mockRestore()
+      spy2.mockRestore()
+    })
+})
+
+test('should properly reject on failing getAuthHeader() calls', () => {
+  needle.mockResolvedValue(Promise.reject(new Error('Too Many Requests')))
+  const spy = jest.spyOn(tm, 'requestToken')
+  const spy2 = jest.spyOn(tm, 'getToken')
+
+  const proms = []
+
+  for (let i = 0; i < 100; i++) {
+    proms.push(tm.getAuthHeader()
+      .catch((error) => {
+        expect(error).toEqual(new Error('Too Many Requests'))
+      }))
+  }
+
+  return Promise.all(proms)
+    .then(() => {
+      expect(spy).toHaveBeenCalledTimes(100)
+      expect(spy2).toHaveBeenCalledTimes(100)
+      spy.mockRestore()
+      spy2.mockRestore()
+    })
+})
+
+test('should properly reject on failing getAuthHeader() calls in different TokenManager instances', () => {
+  needle.mockResolvedValue(Promise.reject(new Error('Too Many Requests')))
+  const proms = []
+
+  for (let i = 0; i < 100; i++) {
+    const _tm = new TokenManager({ iamApikey: '12345' })
+    proms.push(_tm.getAuthHeader()
+      .catch((error) => {
+        expect(error).toEqual(new Error('Too Many Requests'))
+      }))
+  }
+
+  return Promise.all(proms)
+})
+
+jest.setTimeout(120000)
+
 test('should properly timeout on network slowness', () => {
-  jest.setTimeout(120000)
   needle.mockResolvedValue(new Promise((resolve) => {
-    setTimeout(() => { resolve(validToken) }, 100000) // current limit is 90000 for the Promise timeout
+    setTimeout(() => { resolve(validToken) }, 100000).unref() // current limit is 90000 for the Promise timeout
   }))
   return tm.getAuthHeader()
-    .then(resp => {
+    .then(() => {
       jest.fail('Got response, but expected an Error')
     })
     .catch(err => {